Die for u-shaped pipe-bends.



N. C. F'HAND-SEN. DIE FOR U-SHAPED PIPE BENDS.

APPLlcmoN msu APR. 5. 19x2.

Patented Dec. 321, 1915.

www

m M RN EF VF Nr. im m, u M E u. .M

WIYNESSES `of the completed pipe NELS UHRSTPHER FRANDSEN.

nous, GERMANY.

F COPENHAGEN, DENMARK, ASSIGNOR TO SCHMIDWSCHE HIESSDAIVIPF GESELLSCHAFT M.

B. H., OF CASSEL-WLHELMS- My invention has especial utility in the' manufacture of superheater pipes for smoke tube superheaters7 such pipes generally having two or more adjacent legs united by UL shaped bends.

will be better understood by My inveiotion drawings accompanying in referring to the which- Figure l represents' an end elevation of a preferredv form oi? a die; F ig. 2 represents a section taken along the line 2*,2l of Fig. l, a pipe end being shown n situ; Fig. 3 represents the die opened as is required for the removal of a formed pipe end; Fig. i represents in central longitudinal section a pipe. end ready to be formed; Fig. 5 represents in section two formed pipe ends as they appear when positioned for welding` or after being vv'elded, the section being taken in the plane oi" the pipes; and lfig. 6 represents in s ection a complete pipe bend having its point reinforced.

Essentially my die embodies a. body portion comprising two, preferably, substantially similar' hinged sections each of which is scooped out in the form which halt of a Apipe end is to have ai'ter it is bent. The two sections ot the die being closed together, provision is made for an inner horn or mandrei attached to the die to be swung` into that portion ot the die which represents the bend end in such a Way as a core spaced away from the e. the walls ot the scooped out to constitute die walls (a Specification of Letters Patent.

Application led April 5, 1912.

said ournals E,

serial no. esente.

pipe end when .suit-y Patented Dec.. 2li, iltllld.

y invention will be better understood by referring to the drawing in which A, designates the lower section of the die .and B the upper section which lower section by a pintle C at the left of .the die. At the right, each section of the die 1s scooped out so as to conform to the shape which a half pipe end should have after said pipe end has been bent ready for Welding to the other pipe end. When the two halves of the die are closed together, therefore, these two scooped-out portions exactly conform in eonguration to the shape of a finished pipe end.

A separate piece H extending beyond the top die sections, which closely halves are thus closed together. tongues are suitably cut away journals E fixed to the two halves of the die. The piece H has attached to it, midway bes tween the tongues F, a curved horn or man-` drel D so positioned that when the piece H' with its tongues F These the curved portion of the die in the region corresponding to the tube end so as to be substantially concentric with but spaced from the curved walls ot' the die. horn is thus positioned, a fiat bolt M is slipped through suitably located bolt holes G which have been formed botlrin` the tongues F and in the two die halves A and B so that' said two halves rigidly locked together.

is hinged to the and bottom of the combined and closedl is provided with tongues l? embrace the die when lthe two so as to engagel )Vhen the f is rotated upon the aore! f this horn will register with' and the horn D are The operation ot' the die is as follows: A

pipe end of diameter corresponding to the scooped out portion of the die is sawed oit at an angle L (Fig. 4). This pipe end is then heated to a red heat and forced into the straight portion of the die opening at N- (F ig. 2), so that the point L of the tube end will strike the curved portion ot the f die at I; this will canse. the pipe end, if suitiicient pressure be applied, to be bent around the curved portion of the die opening be` tween the wall thereof and the horn D.

lf it is desired that the pipe end shall be thickened or reinforced 'at and near its point at the outer side thereof, this may be readily accomplished by havingr the scooped out portion of the die in this region enlarged to any desired extent, as shown for example by the dottedli/ne N, Fig. By suitably defining' this region ot enlargement, the wall thicknessj'of the finished pipe end may be made to-lessen gradually from a maximum at the ipoint of the pipe end to a normal thickness at any chosen distance from said point. Fig. G shows a linished pipe bend thus reinforced. rlhis reinforcing` is very desirable in superheater pipes in order that they may withstand the heat of the furnace gases which is most intense at the points of the U bends lying adjacent to the lire box. A single pipe end having been formed as above described, the bolt M is knocked out and the piece l-l with its tongues F rotated upon the journals E so as to withdraw the horn D from the die opening. A suitable number of pipe ends having been formed, they may then be joined together in pairs as indicated in Fig. 5, and the ends welded in any convenient manner.

l have described my invention as applied to a die for forming` one pipe end at a time, but dies embodying my inventive idea and providing for bending a number of pipe ends simultaneously may easily be arranged. As described my die is ope 'ated by hand but it may, if preferred, be operated by power within the scope of my invention.

Having described my invention, l claim: l. A. die for bending pipe ends comprising a body portion provided with a suitable die opening, having the forni of a completely inclosed bore, part of which is curved, and an inte-gral horn held rigidly within said curved part but spaced from the walls thereoit during the bending process the cross section of said horn becoming less as :its end is approached. l

2. A die-for bending .pipe ends comprising a body portion provided with a suitable die opening, having the torm otl a com-` pletely inclosed bore, one end ot' which is curved while the remainder 1s straight, an

integral horn held rigidly within said curved' part but spaced from the walls thereof during the bending process the cross section of said` horn becoming less as its end is approached, and means for instantly releasing and removing said horn when the bending lprocess is completed,

3: A tor bending pipe ends compris- L `ine/ieee ing a body portion having separable sections and provided with a` suitable die opening part ol' which is curved, a horn movably attached to said body portion and adapted to be inserted into and removed from said curved part, and means .tor simultaneously locking said sections together and for holding said horn within said curve...Y part during the bending process. I

A. die ,for bending pipe ends comprising a body portion having separable sections and provided with a suitable die opening part of which is curved, a horn adapted to be inserted within the curved part said horn being irovided with tongues which closely embrace the die when its sections are closed, and means for locking sani/tongues to said body portion so as to hold them closed and the horn immovable.

ing a body portion provided with a suitable die opening` part ot' which is curvedvwhile the remaining part straight, an integral horn rigidly attached to the die but spaced therefrom and extending through the curved part into the straight part, the inner contour 01"' the horn conforming to the inner contour oit the curved part of the die opening and then having a straight part conforming to a straight part ot the die opening and the outerlcontour ot the curvedpart of the horn being continuously curved so as to `ioin the inner contour ot the horn, and means ior disattaching said horn when the bending process is completed.

(5. die Jor bending pipe ends comprising a body portion provided with a suitable die opening part ot which is curved while he remaining part is straight, the cross-scction ot said curved part being enlargedin the region oi its outer end, and an integral horn attached to the die but spaced thereironi and extending into said curveiil part, the space between horn and die being ,greatestv in the region ot the outer end oi said curved part.

7. A, die for bending pipe ends comprising` a body portion provided with a suitable die opening part oilt which is curved while the remaining part is straight, the cross-section o'il said curved part being enlarged in the region oi its end. and an integral horn attached to the die but spaced therefrom and extending into said curved part, the crosssection ol' said horn in the region of its base being also enlarged and the space between horn and die being greatest in the region of the outer end oit said curved part.

/ S. A die for bending pipe ends comprisingr a body portion provided witha suitable die opening part of which is curved while the remaining part is straight, the crosssection ot said curved part being enlarged at its outer end, an integral hornv rigidly at- 5. fi die for bending pipe ends comprisasf tached to the die but lspaced tlu'lrcfroln und extending through the curved puri int the straight purt. thrl s1)air0.|10t\\'r011 horn uur]` he heilig greutcst in the rvginn mi the outer 0nd. of Suhl curved part. tho inner contour 0f the horn conforming tu the inner contour of hc curved pzut of the liv opvning und then having :l strnight puri; conforming 10 :1 straight puri of the die opening: und the outer contmu' of the curved part of the horn bring continuously curved so als t0 juin the inner wnmur of thv horn, und means For ins-Munir iiimtzuhing Suid horn when the hcnllingf pri/)unas in rouiphtml.

In Usl'iinfnrv uhm-wil huw hvrvllnto SCi', 1' nu' hsuul in hr prossime of two suhscribing witnesses.

BLS CIIKS'I'OPIIER FRNDSEN.

Wi tin-snes: 

